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Carbon Steel Tubes for Boilers & Heat Exchangers - JIS G 3461 from China Suppliers & Factory
Ordering Information
When ordering, the following must be specified:
- Standard number (JIS G 3461)
- Steel grade (e.g., STB340, STB410, STB510)
- Dimensions (outer diameter, wall thickness, length)
- Test requirements (if additional tests are needed)
- Delivery condition (e.g., annealed, normalized)
- Special requirements (if any, such as hydrostatic testing or non-destructive testing)
Material Requirements
3.1 Steel Grades and Chemical Composition
- STB340, STB410, STB510, etc.
- Specifies carbon (C), manganese (Mn), phosphorus (P), sulfur (S), and silicon (Si) content limits.
3.2 Mechanical Properties
- Tensile strength, yield strength, and elongation requirements for each grade.
- Hardness limits (if applicable).
Manufacturing Process
- Tubes are manufactured by seamless or welded processes.
- Heat treatment (annealing or normalizing) is required unless otherwise specified.
Test Requirements
5.1 Mandatory Tests
- Tensile test (one test per batch)
- Flattening test or bend test (for welded tubes)
- Hydrostatic test or non-destructive test (NDT) (eddy current, ultrasonic, etc.)
5.2 Optional Tests (upon agreement)
- Impact test (for low-temperature applications)
- Hardness test
- Grain size test
Inspection & Acceptance Criteria
- Tubes must meet dimensional tolerances (outer diameter, wall thickness, length).
- Surface defects must be within acceptable limits.
- Re-testing is allowed if initial tests fail under specified conditions.
Marking & Packaging
Each tube must be marked with:
- Manufacturer's name or trademark
- Steel grade
- Size
- Heat number or lot identification
- Packaging must prevent damage during transportation.
Additional Notes
- Compliance with JIS G 3461 ensures suitability for high-temperature and pressure applications.
- Latest revisions may include updates to testing methods, chemical composition, or mechanical property requirements.
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Frequently Asked Questions
What is JIS G 3461 and what is it used for?
JIS G 3461 is a Japanese Industrial Standard that specifies carbon steel tubes designed for use in boilers and heat exchangers. These tubes are engineered to withstand high-temperature and high-pressure operating conditions in industrial environments.
What steel grades are available under JIS G 3461?
JIS G 3461 covers multiple steel grades including STB340, STB410, and STB510. Each grade has specific chemical composition and mechanical property requirements to suit different application demands.
What manufacturing processes are used for JIS G 3461 tubes?
Tubes conforming to JIS G 3461 can be manufactured by either seamless or welded processes. Heat treatment such as annealing or normalizing is typically required to meet the standard's mechanical property specifications.
What tests are mandatory for JIS G 3461 tubes?
Mandatory tests include a tensile test (one per batch), a flattening or bend test for welded tubes, and either a hydrostatic test or a non-destructive test (NDT) such as eddy current or ultrasonic testing to ensure structural integrity.
What information is required when placing an order for JIS G 3461 tubes?
When ordering, you must specify the standard number (JIS G 3461), the steel grade, dimensions (outer diameter, wall thickness, length), delivery condition, test requirements, and any special requirements such as hydrostatic or non-destructive testing.
How are JIS G 3461 tubes marked and packaged?
Each tube must be clearly marked with the manufacturer's name or trademark, steel grade, size, and heat number or lot identification. Packaging must be designed to protect the tubes from damage during transportation and storage.